<div id="mapContainer" style="height:500px; max-width:800px; margin: 0 auto"></div>
<div id="selectContainer" style="height:20px; max-width:450px; margin:5px auto; text-align:center">
    Choose a Marker Type:
    <select id="dropdownListSelector">
        <option value="dot">dot</option>
        <option value="bubble">bubble</option>
        <option value="pie">pie</option>
    </select>
</div>